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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets. There were no changes in the carrying amount of goodwill for the six months ended June 30, 2014.

Other intangible assets at June 30, 2014 and December 31, 2013, consisted of the following (in thousands):
 
June 30, 2014
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
10,108

 
$
(2,511
)
 
$
7,597

Distribution agreements
5,176

 
(2,019
)
 
3,157

License agreements
3,783

 
(1,509
)
 
2,274

Trademarks
7,619

 
(2,091
)
 
5,528

Covenants not to compete
1,029

 
(518
)
 
511

Customer lists
20,621

 
(12,106
)
 
8,515

Royalty agreements
267

 
(267
)
 

 
 
 
 
 
 
Total
$
48,603

 
$
(21,021
)
 
$
27,582


 
December 31, 2013
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
Patents
$
9,302

 
$
(2,374
)
 
$
6,928

Distribution agreements
5,176

 
(1,780
)
 
3,396

License agreements
3,783

 
(1,249
)
 
2,534

Trademarks
7,622

 
(1,844
)
 
5,778

Covenants not to compete
1,029

 
(399
)
 
630

Customer lists
20,626

 
(10,957
)
 
9,669

Royalty agreements
267

 
(267
)
 

 
 
 
 
 
 
Total
$
47,805

 
$
(18,870
)
 
$
28,935



Aggregate amortization expense related to developed technology and other intangible assets for the three and six-month periods ended June 30, 2014 was approximately $3.7 million and $7.4 million respectively, and approximately $3.5 million and $7.0 million for the three and six-month periods ending June 30, 2013, respectively.

Estimated amortization expense for developed technology and other intangible assets for the next five years consists of the following as of June 30, 2014 (in thousands):

Year Ending December 31
 
Remaining 2014
$
7,741

2015
14,793

2016
14,059

2017
13,661

2018
13,137